twin hole fiber is primarily used for distributed pressure sensing. when exposed to hydrostatic pressure, the core exhibits a differential in the stress on the x and y axes, creating localized
birefringence. using distributed sensing techniques or point sensors, for example fiber bragg gratings (fbgs), an accurate measurement of pressure may be obtained. there are also applications for filling the holes with liquids or gasses for various chemical sensing applications where the evanescent wave from light on the x-axis interacts with the liquid or gas.
by having such sensors manufactured with optical fiber, the sensors are suitable for high temperature environments. the sensors can be miniaturized for in-vivo biomedical applications and can be deployed in environments with high electromagnetic interference (emi) for example in magnetic resonance imaging (mri). this opens up possibilities in downhole process monitoring and
optimization by measuring flow rates, pipeline security by monitoring slow leaks and catastrophic effects as well as various biomedical applications such as precise location of coronary artery disease (atherosclerosis) and carotid artery disease, which cause heart attacks and strokes respectively.
fibercore brings together fiber and fbg manufacturing expertise to provide customers with optimized solutions by varying hole size and position, core dimensions, operating wavelength, fbg characteristics and core chemistry. to the right is a representative cross section of a twin hole fiber and on the next page a typical product specification shown. customized designs are available and welcome.​

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